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First check AC fuse, if OK, next check the blower motor by itself by disconnecting the wires connected to it and see if it works by connecting it directly to the battery power. If the blower works that way, then there could be an issue with some sensors or the conputer. Try disconnecting the battery for a while and also theAC fuse at re same time and then reconnect then. Many times alot of problems are solved this way because the computer, which operate many sensors nowadays, will automatically resest after being disconnected for a while. It that still doesn't work, there might be something more serious going on. Hope only what I have suggested helps.

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When troubleshooting to try and repair the car heater, check the coolant ... If a cooling system is full and there's still no hot air coming from the vents, .... Hi I have 2001 ford expedition and theheater just blows out cold air and ...

It sounds like you have air trapped in the cooling system. Try filling the radiator and coolant reservoir cold. Then leave the radiator cap loose and run engine at 1500 rpm until it warms up and the thermostat opens. Make sure heater is on full warm setting.

The main fuse block located under the hood for the 1991 ford probe shows 13 fuses. There is a fuse that contros the heating, AC & Programmed ride control system. It is a 40 amp fuse and has a blue wire.the color code for a 40 amp fuse is green.

I would start by checking for coolant leaks. Common places would be in the waterpump or heater core. Heater cores can crack and leak. The heat from your vents inside the vehicle comes from air passing over the heater core, which is heated by the hot coolant flowing through the heater core. It acts in a similar fashion to your radiator, with the purpose of heat transfer. A coolant system that is low on coolant will not transfer heat through the heater core. Also, deposits from the coolant system can collect and plug the heater core which will restrict the flow and the amount of heat that is transfered to your heater. If you don't see coolant leaking externally, it may be leaking into the engine. this may be from a blown head gasket or warped head. If this is the case you may notice some whitish color smoke coming from the exhaust, as well as your coolant overflow/storage tank fluid level may increase.
The air conditioning is a seperate system and may be a seperate issue. The system contains liquid freon like a refrigerator. You can by recharge kits at your local autoparts store. If the kit works, you may find there is a leak in the system and you will loose cold air after some time. If thats the case, a certified dealer can fill the system with colored dye to help locate the leak. A bad compressor or evaporater can also cause a/c systems to fail.

IF U ARE TRYIN TO GET THE HEAT U CAN DO 3 THINGS
1. TURN HEATER ON THE FACE/FEET POSITION AND PLACE ON HIGH, TAKE THE RADIATOR CAP OFF AND CONTINUE TO POUR WATER/COOLANT UNTIL HEAT GETS HOT
2. CHECK/REPLACE THERMASTAT
3. CHECK/REPLACE HEATER CORE

ford uses vacuum operated valves to open and close the ducts in the heat- a/c box on most models... look under the dash on the right side (passenger) on the top of the heater/ blower case..there is a plastic connection that has about 5 or 6 color coded vacuum lines going to it i would check this to see if maybe it has worked loose! also follow the vacuum lines back to the engine bay to see whether any of those have come loose...

Could be a couple of things. The first thing that I would check would be the coolant level in the radiator, if that is low it can cause the heater not to blow hot air. The second thing I would find out is if the control to change from cold to hot is actually working? ( if it is a manual slider then the cable might have come off of the control behind the dash...if it is digital then there may be a wire off?) The third thing it might be is that your Heater Core went bad and will need to replaced. As I said above, I would check the coolant level first and go from there. Hope it helps!